Polycylic dyes

ABSTRACT

A process for the preparation of a polycyclic dye of Formula I: &lt;CHEM&gt;  by reacting a phenyltartronic acid of Formula II: &lt;CHEM&gt;  wherein  W is - NR&lt;1&gt;R&lt;2&gt; or - OR&lt;3&gt;; R&lt;3&gt; is H or an optionally substituted alkyl, alkenyl, cycloalkyl or aralkyl group; R&lt;1&gt; &amp; R&lt;2&gt; are each independently H or an optionally substituted alkyl, alkenyl, cycloalkyl, aralkyl or aryl group; or R&lt;1&gt; &amp; R&lt;2&gt; together with the nitrogen atom to which they are attached form a heterocyclic ring; or R&lt;1&gt; or R&lt;2&gt; together with the nitrogen atom and the adjacent carbon atom of Ring B form a heterocyclic ring; and Ring B is unsubstituted, apart from the group W, or is substituted by one or two further groups;  with either (a) a compound of Formula III: &lt;CHEM&gt;  wherein, Z&lt;1&gt; &amp; Z&lt;2&gt; are each independently - O -, - S - or - NY - in which Y is H, an optionally-substituted hydrocarbon group or an acyl group; X&lt;1&gt; &amp; X&lt;2&gt; are each independently selected from H, halogen, cyano, alkyl, aryl, carbamoyl, sulphamoyl, COOH and carboxylic acid ester; &amp; Ring A is unsubstituted or is substituted by from one to three groups;  or (b) a compound of Formula IV: &lt;CHEM&gt;  wherein Z&lt;1&gt;, Z&lt;2&gt;, X&lt;1&gt; and X&lt;2&gt; are as hereinbefore defined; and oxidation of the intermediate compound to dehydrogenate the peripheral heterocyclic rings. The invention also comprises a product of the aforementioned process which is suitable for the colouration of polyester textile material in shades from green through to reddish-blue of the formula: &lt;CHEM&gt;  wherein: X&lt;1&gt; &amp; X&lt;2&gt; each independently is H, cyano, alkyl, aryl, carbamoyl, sulphamoyl, COOH or carboxylic acid ester; Z&lt;1&gt; &amp; Z&lt;2&gt; each independently is - O -, - S - or - NY - in which Y is H, an optionally-substituted hydrocarbon group or an acyl group; R&lt;1&gt; &amp; R&lt;2&gt; each independently is H or an optionally substituted alkyl, alkenyl, cycloalkyl, aryl or aralkyl group; or R&lt;1&gt; &amp; R&lt;2&gt; together with the N atom to which they are attached, form a heterocycle; R&lt;4&gt; &amp; R&lt;5&gt; each independently is H, halogen or an optionally substituted alkyl, alkenyl or alkoxy group; or R&lt;1&gt; &amp; R&lt;4&gt; together with the N atom and the two carbon atoms in Ring B to which they are attached form a heterocycle fused to Ring B; or R&lt;2&gt; &amp; R&lt;5&gt; together with the N atom and the two carbon atoms in Ring B to which they are attached form a heterocycle fused to Ring B; R&lt;6&gt; is H, halogen, an optionally substituted alkyl or alkoxy group or a group NR&lt;1&gt;R&lt;2&gt; in which each of R&lt;1&gt; and R&lt;2&gt; independently is as hereinbefore defined; R&lt;7&gt; &amp; R&lt;8&gt; each independently is H, halogen or an optionally substituted alkyl, alkenyl or alkoxy group; or R&lt;1&gt; &amp; R&lt;7&gt; together with the N atom and the two carbon atoms in Ring A to which they are attached form a heterocycle fused to Ring A; or R&lt;2&gt; &amp; R&lt;8&gt; together with the N atom and the two carbon atoms in Ring A to which they are attached form a heterocycle fused to Ring A; and where R&lt;6&gt; is NR&lt;1&gt;R&lt;2&gt;, this may be the same as or different from the NR&lt;1&gt;R&lt;2&gt; group present in Ring B.

This specification describes an invention relating to a process for the preparation of certain polycyclic dyes.

According to the present invention there is provided a process for the preparation of a polycyclic dye of the Formula I: ##STR2## by reacting a phenyltartronic acid of Formula II: ##STR3## wherein W is --NR¹ R² or --OR³ ;

R³ is H or an optionally substituted alkyl, alkenyl, cycloalkyl or aralkyl group;

R¹ & R² each independently is H, or an optionally substituted alkyl, alkenyl, cycloalkyl, aralkyl or aryl group; or

R¹ & R² together with the nitrogen atom to which they are attached form a heterocyclic ring; or

R¹ and R² together with the nitrogen atom and the adjacent carbon atom of Ring B form a heterocyclic ring; and

Ring B is unsubstituted, apart from the group W, or is substituted by one or two further groups;

with either (a) a compound of the Formula III: ##STR4## wherein, Z¹ & Z² each independently is --O--, --S-- or --NY-- in which Y is H, an optionally, substituted hydrocarbon group or an acyl group;

X¹ & X² each independently is H, halogen, cyano, alkyl, aryl, carbamoyl, suphamoyl, COOH or carboxylic acid ester; &

Ring A is unsubstituted or is substituted by from one to three groups;

or (b) a compound of the Formula IV: ##STR5## wherein Z¹, Z², X¹ and X² are as hereinbefore defined; and oxidation of the intermediate compound to dehydrogenate the peripheral hetercyclic rings.

The optionally substituted hydrocarbon group represented by Y is preferably C₁₋₈ -alkyl, and more preferably C₁₋₄ -alkyl, or monocyclic aryl, more preferably phenyl. The acyl group represented by Y is preferably C₁₋₄ -alkyl- or monocyclic-aryl-carbonyl or -sulfphonyl which may be substituted by one or more groups selected from hydroxy, halogen, nitro, C₁₋₄ -alkyl and C₁₋₄ -alkoxy. Examples of the optionally substituted hydrocarbon groups represented by Y are alkyl and preferably C₁₋₄ -alkyl, such as methyl, ethyl, n-propyl and iso-propyl; substituted alkyl, preferably substituted C₁₋₄ -alkyl, such as beta-hydroxyethyl, beta-methoxyethyl and beta-ethoxyethyl; phenyl and substituted phenyl such as tolyl, chlorophenyl, nitrophenyl and C₁₋₄ -alkoxyphenyl. Examples of the acyl groups represented by Y are acetyl, propionyl, n-butyryl, iso-butyryl, benzoyl and nitrobenzoyl, chlorobenzoyl, methylbenzoyl, methoxybenzoyl and hydroxybenzoyl.

The aryl group represented by X¹ or X² or preferably mono-homocyclic aryl, that is phenyl and substituted phenyl. The C₁₋₄ -alkyl and alkoxy groups represented by X¹ or X² may also be substituted and suitable substituents for these and the aryl group are hydroxy, halogen, nitro, C₁₋₄ -alkyl and C₁₋₄ -alkoxy. The halogen represented by X¹ or X² is preferably chlorine or bromine.

The carbamoyl and sulphamoyl groups represented by X¹ or X² are preferably of the formula --CONL¹ L² or --SO₂ NL¹ L² wherein L¹ and L² are each independently hydrogen, C₁₋₄ -alkyl or monocyclic aryl, preferably phenyl. The carbonylic acid ester groups represented by X¹ and X² are preferably of the formula --COOL³ wherein L³ is optionally substituted alkyl, especially C₁₋₄ -alkyl, or monocyclic aryl, especially phenyl, in which the substituents are as defined above.

When any of R¹ to R³ is alkyl or alkenyl it preferably contains up to 20, more preferably up to 10 carbon atoms and especially up to 4, carbon atoms, with a preferred minimums of 3 carbon atoms for alkenyl groups); when cycloalkyl it is preferably C₄₋₈ -cycloalkyl, such as cyclohexyl; and when aryl or aralkyl, the aryl is preferably monohomocyclic aryl, i.e. phenyl, and the aralkyl is preferably phenyl-C₁₋₄ -alkylene, such as benzyl and phenylethyl. Where the groups represented by R¹ to R³ are substituted, examples of preferred substituents are alkyl, alkoxy, nitro, halogen, alkoxyalkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, alkylcarbonyl, alkoxycarbonyl, alkoxyalkoxycaronbyl, alkoxycarbonyloxy, alkoxyalkoxycarbonyloxy, alkylcarbonyloxy, cyano and amino in which each alkyl is preferably C₁₋₄ -alkyl. Where the groups represented by R¹ and R², together with the nitrogen atom to which they are attached, form a heterocyclic group this is preferably alicyclic, such as piperidino or morpholino. Where a group represented by R¹ or R² together with the nitrogen atom to which heterocyclic group fused to Ring B or Ring A respectively, this is preferably a 6-membered heteroaliphatic ring, i.e. R¹ or R² is trimethylene, and the combined fused rings preferably form a tetrahydroquinolyl group.

It is preferred that the compound of Formula I is "unsymmetrical" by virtue of differences in the definitions of Z¹ and Z², X¹ and X² and/or Ring B, because lack of symmetry generally gives rise to an improvement in dyeing performance, especially in build-up on the fibre. However, it is generally preferred that Z¹ and Z² are identical and X¹ and X² are identical and that the lack of symmetry arises from differences in Rings A and B. Where Ring A and Ring B are different, the difference preferably lies in the nature and/or the number of substituents carried by each ring. The difference lies preferably in the identity of the groups R¹ to R³ but may lie in the identity and/or the number of the substituents carried by the rings. Examples of further substituents for Ring B, in addition to the group W, are alkyl; alkenyl; alkoxy; alkoxyalkoxy; alkoxycarbonylalkoxy; alkoxyalkoxycaronbylalkoxy; alkylcarbonyloxyalkoxy; cyanoalkoxy, hydroxyalkoxy; halogen, especially chloine or bromine; hydroxy; alkylthio; arylthio; aryloxy; alkylcarbonyl and alkylsulphonyl; and especially such groups in which the alkyl or alkenyl contains up to 4 carbon atoms and the aryl is phenyl. Examples of substituents for Ring A, in addition to those listed above for Ring B, are NR¹ R², OR³ and NHacyl, especially NHCOC₁₋₄ -alkyl and --NHSO₂ C₁₋₄ -alkyl.

It is preferred that X¹ and X² are both hydrogen and also preferred that Z¹ and Z² are both oxygen. When both these pairs of groups are identical, the preferred asymmetry in the compound of Formula I is provided by differences in Rings A and B. By this is meant that there is either a different number or different pattern of substituents on each ring.

The present process may be performed by heating the reactants in a melt but preferably in an acidic medium, preferably an organic acid, and especially an alkanecarboxylic acid such as acetic acid, propionic acid or butyric acid.

It is preferred to perform the process in which W is OR³ in the presence of a strong acid catalyst, especially H₂ SO₄. However, where W is NR¹ R² such a catalyst is not generally required and is believed to have an adverse effect on the process.

The process is preferably performed at a temperature from 50° C. to 100° C., especially 70° C. to 100° C., where a solvent is present, conveniently under reflux. Reaction is preferably continued until all the starting materials are consumed which can take up to 25 hours.

Further reactions of the dyes in which any or all of R¹, R² and R³ are H with alkylating, arylating or acylating agents permits the preparation of a wide range of substituted hydroxy and amino (secondary and tertiary amino) groups.

The final oxidation step may be effected by any convenient oxidising agent for dehydrogenating a carbon-carbon single bond, such as a persulphate or hydrogen peroxide.

The compound of Formula III, in which Ring A also carries a group NR¹ R², may be prepared by the reaction of an amino-mandelic acid (in which the amino group is protected, if necessary, by acylation) with a hydroquinone in accordance with the procedure described in GB 2,068,402A.

According to a further feature of the present invention there is provided a process for the preparation of a compound according to Formula III in which Ring A carries a group NR¹ R² in the 4-position which comprises reacting a mandelic acid of the Formula V: ##STR6## wherein A has the same meaning as in Formula I with a compound of the Formula VI: ##STR7## wherein X¹ and X² have the same meanings as in Formula I. It is preferred that, in Formula VI, X¹ and X² are both hydrogen.

This reaction is conveniently performed in an acidic medium in the presence of a strong acid catalyst as described above for the preparation of the compound of Formula I but at a lower temperature in the range 40° C. to 80° C. especially from 49° C. to 75° C.

The present process is especially suitable for the preparation of compounds of Formula I in which:

(a) Ring B carries a group, NR¹ R², and both rings, optionally, carry one or more other substituents; or

(b) Rings A and B both carry a group, NR¹ R², which may be the same or different, and, optionally, one or more other substituents.

Compounds of Formula I in which W is NR¹ R², Ring B carries a methyl group adjacent to NR¹ R² and Ring A is unsubstituted or substituted in the 4-position by an alkyl or alkoxy group give blue shades when applied to synthetic fibres, especially polyesters, by disperse dyeing processes, and build up well to give navy shades and such compounds form a feature of the present invention.

According to a further feature of the present invention there is provided a compound of the formula: ##STR8## wherein X¹ & X² each independently is H, cyano, alkyl, aryl, carbamoyl, sulphamoyl, COOH or carboxylic acid ester;

Z¹ & Z² each independently is --O--, --S-- or --NY-- in which Y is H, an optionally-substituted hydrocarbon group or an acyl group;

R¹ & R² each independently is H or an optionally substituted alkyl, alkenyl, cycloalkyl, aryl or aralkyl group; or

R¹ & R² together with the N atom to which they are attached, form a heterocycle;

R⁴ & R⁵ each independently is H, halogen or an optionally substituted alkyl, alkenyl or alkoxy group; or

R¹ & R⁴ together with the N atom and the two carbon atoms in Ring B to which they are attached form a heterocycle fused to Ring B; or

R² & R⁵ together with the N atom and the two carbon atoms in Ring B to which they are attached form a heterocycle fused to Ring B;

R⁶ is H, halogen or an optionally substituted alkyl or alkoxy group or a group NH¹ R² in which each of R¹ and R² is as hereinbefore defined;

R⁷ & R⁸ each independently is H, halogen or an optionally substituted alkyl, alkenyl or alkoxy group; or

R¹ & R⁷ together with the N atom and the two carbon atoms in Ring A to which they are attached form a heterocycle fused to Ring A; or

R² & R⁸ together with the N atom and the two carbon atoms in Ring A to which they are attached form a heterocycle fused to Ring A;

and where R⁶ is NR¹ R² this may be the same as or different from the NR¹ R² group present in Ring B.

It is preferred that the compound of Formula VII is "unsymmetrical" by virtue of differences in the definitions of Z¹ and Z², X¹ and X² and/or the number and pattern of substituents on Ring A and Ring B, because lack of symmetry generally gives rise to an improvement in dyeing performance, especially in build-up on the fibre. It is preferred that X¹ and X² are the same and preferably H. It is also preferred that Z¹ and Z² are the same and preferably oxygen. Where X¹ and X² are identical and Z¹ and Z² are identical it is preferred that the lack of symmetry arises from a difference in the number or pattern of substituents on Ring A and Ring B.

Preferences for the groups represented by X¹, X², Z¹ and Z² are the same as for the same groups in Formula I.

In Ring A it is preferred that R⁶ is independently selected from H, halogen, C₁₋₁₀ -alkyl, C₃₋₁₀ -alkenyl, C₁₋₁₀ -alkoxy and NR¹ R², in which each of R¹ and R² is independently H; C₁₋₆ -alkyl, more especially C₁₋₄ -alkyl; or C₁₋₄ -alkyl substituted by a group selected from alkoxy, alkoxyalkoxy, hydroxy, cyano, halogen especially chlorine or bromine, phenyl, alkoxycarbonyl, alkoxyalkoxycarbonyl and alkylcarbonyloxy in which all the alkyl groups preferably contain up to 4 carbon atoms. Alternatively either R¹ and R⁷ or R² and R⁸, together with the N atom to which R¹ or R² is attached and two carbon atoms in Ring A, may form a piperidine ring fused to Ring A or R¹ and R², together with the N atom to which they are attached, may form a pendant mono or bicyclic hetercyclic group, especially piperidino or mopholino, attached to Ring A through the N atom. Where R⁶ is not NR¹ R², it is preferred that each of R⁷ and R⁸ is H.

In Ring B it is preferred that each of R¹ and R² independently is H; C₁₋₆ -alkyl, more especially C₁₋₄ -alkyl; or C₁₋₄ -alkyl which is optionally substituted by a group selected from alkoxy, alkoxyalkoxy, hydroxy, cyano, halogen especially chlorine or bromine, phenyl, alkoxycarbonyl, alkoxycarbonyloxy, alkoxyalkoxycarbonyl and alkylcarbonyloxy in which all the alkyl groups preferably contain up to 4 carbon atoms; or that either R¹ and R⁴ or R² and R⁵, together with the N atom to which R¹ or R² is attached and two carbon atoms in Ring B, form a piperidine ring fused to Ring B; or that R¹ and R², together with the N atom to which they are attached, form a pendant mono or bicyclic heterocyclic group, especially piperidino or morpholino, attached to Ring B through the N atom. It is preferred that at least one of R⁴ and R⁵ is other than hydrogen and, especially, an alkyl or alkoxy group as hereinafter more specifically defined.

The alkyl group represented by R⁴, R⁵, R⁶, R⁷ or R⁸ is preferably C₁₋₄ -alkyl, especially methyl or ethyl. The alkenyl group represented by R⁴, R⁵, R⁶, R⁷ or R⁸ is preferably C₃₋₄ -alkenyl, especially allyl. The alkoxy group represented by R⁴, R⁵, R⁶, R⁷ or R⁸ is preferably an unsubstituted C₁₋₁₀ -alkoxy or a C₁₋₄ -alkoxy group which is substituted by a group selected from alkoxy, hydroxy, alkylcarbonyloxy, alkoxyalkoxycarbonyl, alkoxycarbonyl, halogen and cyano, in which all the alkyl groups preferably contain up to 4 carbon atoms. The halogen represented by R⁴, R⁵, R⁶, R⁷ or R⁸ is preferably chloine or bromine.

In one preferred sub-class of the compound of Formula VII, X¹, X² and R¹ are H; Z¹ and Z² are oxygen; R² is H or C₁₋₄ -alkyl; R⁴, R⁵, R⁷ and R⁸ each independently is H, C₁₋₄ -alkyl or C₁₋₁₀ -alkoxy, more especially C₁₋₄ -alkoxy; and R⁶ is NH₂. The dyes of this preferred sub-class of Formula VII, generally give reddish-blue to turquoise shades on polyester textile materials with excellent fastness properties, especially heat and wet fastness. Specific examples of such dyes are:

                  TABLE 1                                                          ______________________________________                                         R.sup.1                                                                               R.sup.2 R.sup.4  R.sup.5                                                                               R.sup.6                                                                              R.sup.7                                                                              R.sup.8                             ______________________________________                                         H      H       CH.sub.3 H      NH.sub.2                                                                             H     H                                   H      H       OCH.sub.3                                                                               H      NH.sub.2                                                                             H     H                                   H      H       Cl       H      NH.sub.2                                                                             H     H                                   H      H       C.sub.2 H.sub.5                                                                         H      NH.sub.2                                                                             H     H                                   H      H       CH.sub.3 CH.sub.3                                                                              NH.sub.2                                                                             H     H                                   ______________________________________                                    

In another preferred sub-class of the compound of Formula VII, X¹, X², R¹, R⁵, R⁷ and R⁸ are H; Z¹ and Z² are oxygen; R² is C₁₋₄ -alkyl; R⁴ is C₁₋₄ alkyl or C₁₋₁₀ -alkoxy, more especially C₁₋₄ -alkoxy; and R⁶ is H, C₁₋₄ -alkyl or C₁₋₄ alkoxy. The dyes of this preferred sub-class of Formula VII build up strongly on polyester textile materials to give strong navy shades with excellent fastness properties, especially heat and wet fastness. Specific examples of such dyes are:

                  TABLE 2                                                          ______________________________________                                         R.sup.1                                                                               R.sup.2 R.sup.4    R.sup.5                                                                             R.sup.6                                                                               R.sup.7                                                                             R.sup.8                             ______________________________________                                         H      H       CH.sub.3   H    H      H    H                                   H      H       CH.sub.3   H    CH.sub.3                                                                              H    H                                   H      H       C.sub.2 H.sub.5                                                                           H    OC.sub.3 H.sub.7                                                                      H    H                                   H      H       n-C.sub.3 H.sub.7                                                                         H    C.sub.3 H.sub.7                                                                       H    H                                   H      H       OCH.sub.3  H    H      H    H                                   H      H       OC.sub.2 H.sub.5                                                                          H    OC.sub.3 H.sub.7                                                                      H    H                                   H      H       O-n-C.sub.3 H.sub.7                                                                       H    OC.sub.3 H.sub.7                                                                      H    H                                   H      C.sub.2 H.sub.5                                                                        CH.sub.3   H    H      H    H                                   ______________________________________                                    

Examples of other dyes according to Formula VII are:

                                      TABLE 3                                      __________________________________________________________________________     R.sup.1                                                                             R.sup.2  R.sup.4                                                                            R.sup.5                                                                           R.sup.6   R.sup.7                                                                           R.sup.8                                                                          X.sup.1                                    __________________________________________________________________________     H    C.sub.2 H.sub.5                                                                         H   H  NH.sub.2  H  H H                                          H    C.sub.2 H.sub.5                                                                         CH.sub.3                                                                           H  NH.sub.2  H  H H                                          H    C.sub.3 H.sub.5                                                                         H   H  NH.sub.2  H  H H                                          H    i-C.sub.3 H.sub.7                                                                       CH.sub.3                                                                           H  NH.sub.2  H  H H                                          H    s-C.sub.4 H.sub.9                                                                       H   H  NH.sub.2  H  H H                                          H    C.sub.2 H.sub.4 COOH                                                                    H   H  NH.sub.2  H  H H                                          --CH.sub.2 CH.sub.2 --O--CH.sub.2 CH.sub.2--                                                 H   H  NH.sub.2  CH.sub.3                                                                          H H                                          --CH.sub.2 CH.sub.2 --O--CH.sub.2 CH.sub.2 --                                                H   H  NH.sub.2  H  H H                                          --CH.sub.2 CH.sub.2 --O--CH.sub.2 CH.sub.2 --                                                H   H  N(EtCOOEtOEt).sub.2                                                                      H  H H                                          H    H        C.sub.2 H.sub.5                                                                    H  NH.sub.2   CH.sub.3                                                                         H H                                          --CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 CH.sub.2 --                                            H   H  NH.sub.2  H  H H                                          H    --CH.sub.2 CH.sub.2 CH.sub.2 --                                                             H  NH.sub.2  H  H H                                          C.sub.2 H.sub.5                                                                     C.sub.2 H.sub.5                                                                         H   H  N(C.sub.2 H.sub.5).sub.2                                                                 H  H H                                          C.sub.2 H.sub.5                                                                     C.sub.2 H.sub.5                                                                         H   H  N(C.sub.2 H.sub.5).sub.2                                                                 H  H CH.sub..sub.3                              H    H        CH.sub..sub.3                                                                      CH.sub..sub.3                                                                     NH.sub.2  CH.sub.3                                                                          H H                                          C.sub.2 H.sub.4 CN                                                                  C.sub.2 H.sub.4 COOCH.sub.3                                                             H   H  OC.sub.3 H.sub.7                                                                         H  H H                                          CH.sub.3                                                                            CH.sub.3 H   H  NH.sub.2  H  H H                                          H    C.sub.2 H.sub.4 OH                                                                      CH.sub.3                                                                           H  NH.sub.2  H  H H                                          H    s-C.sub.4 H.sub.9                                                                       CH.sub.3                                                                           H  NH(s-C.sub.4 H.sub.9)                                                                    H  H H                                          __________________________________________________________________________

In Table 3 and subsequent tables s-C₄ H₉ is ##STR9##

The invention is further illustrated by the following examples in which all parts and percentages are by weight unless otherwise indicated.

EXAMPLE 1

A mixture of 2.84 g of 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzofuran, 4.8 g of 4-amino-3-methyl-phenyltartronic acid (as the dipotassium salt) and 50 ml of glacial acetic acid was stirred under reflux for 18 hours. At the end of this period 2.5 g of ammonium persulphate was added and heating continued for a further 1 hour. After cooling to ambient the precipitated solid was filtered, washed acid-free with water, then methanol, and dried.

A mixture of 3.6 g of this product in 110 ml of 70% sulphuric acid was heated at 95° C. for 7 hours. After cooling, this mixture was drowned into 1 liter of water and the crude product, 3-(4-aminophenyl)-7-(3-methyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b,4:5-b']-difuran, isolated by filtration. This was then extracted into pyridine, screened and the solvent removed under vacuum. The product dissolved in pyridine to give a blue solution with an absorption maximum at 657 nm.

When applied to polyester material from an aqueous dispersion it gave a bright mid-blue shade with excellent heat and wet fastness properties and it also built up well.

The 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzofuran used in this Example was prepared by stirring 21 g of 4-acetylaminomandelic acid and 11 g of hydroquinone in 95 ml of glacial acetic acid and 5 ml 100% sulphuric acid at 55° C. for 21 hours, cooling to ambient and drowning into 1 liter of water. The precipitate was isolated by filtration, washed acid-free with water and dried.

EXAMPLE 2

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 3.2 g of 4-N-ethylaminophenyltartronic acid to give 3-(4-aminophenyl)-7-(4-N-ethylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b,4:5-b']-difuran. This dissolved in pyridine to give a blue solution having an absorption maximum at 667 nm.

When applied to polyester from an aqueous dispersion it gave a bright blue shade with very high heat fastness and excellent wash and perspiration fastness.

EXAMPLE 3

The procedure of Example 1 was repeated except that in place of the 4.8 g of 4-amino-3-methylphenyltartronic acid there was used 4.7 g of 3-methyl-4-N-ethylaminophenyltartronic acid to give 3-(4-aminophenyl)-7-(3-methyl-4-N-ethylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b,4:5-b']difuran. This dissolved in pyridine to give a greenish- blue solution having an absorption maximum at 667 nm.

When applied to a polyester textile material from an aqueous dispersion it gave a greenish blue shade having good fastness to wet treatments and it built up well.

EXAMPLE 5

The procedure of Example 1 was repeated except that in place of the 4.8 g of 4-amino-3-methylphenyltartronic acid there were used 5.0 g of 4amino-3-chlorophenyltartronic acid to give 3-(4-aminophenyl)-7-(4-amino-3-chlorophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b,4:5-b']difuran. This dissolved in pyridine to give a blue solution having an absorption maximum at 645 nm.

When applied to a polyester textile material from an aqueous dispersion it gave a reddish blue shade with good fastness to wet treatments.

EXAMPLE 6

The procedure of Example 1 was repeated except that in place of the 4.8 g of 3-amino-4-methylphenyltartronic acid there were used 5.4 g of 4-beta-carboxyethylaminophenyltartronic acid to give 3-(4-aminophenyl)-7-(4-beta-carboxyethylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b,4:5-b']difuran. A portion of this product (1.3 g) was esterfied by stirring a boiling under reflux for 5 hours in a mixture of 75 ml of methanol and 7.5 ml of concentrated sulphuric acid to give 3-(4-aminophenyl)-7-(4-beta-carbomethoxyethylaminophenyl)- 2,6-dioxo-2,6-dihydrobenzo[1:2-b,4,:5-b']difuran. This dissolved in pyridine to give a blue solution having an absorption maximum at 656 nm.

When applied to polyester textile material from an aqueous dispersion it gave a bright blue shade with good fastness properties.

EXAMPLE 7

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.7 g of 4N-allylaminophenyltartronic acid to give 3-(4-aminophenyl)-7-(4-N-allylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran. This dissolved in pyridine to give a blue solution having an absorption maximum at 663 nm.

When applied to polyester from an aqueous dispersion it gave a bright blue shade with good build up and high fastness to heat and wash treatments.

EXAMPLE 8

The procedure of Example 1 was repeated except that the 2.84 g of 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzo-furan was replaced by 2.26 g of 5-hydroxy-2-oxo-3-phenyl-2,3-dihydro-benzofuran to give 3-phenyl-7-(3-methyl-4-aminophenyl)-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran. This dissolved in pyridine to give a blue solution having an absorption maximum at 620 nm.

When applied to polyester from an aqueous dispersion it built up well to give a navy blue shades with good fastness to heat and wash treatments.

EXAMPLE 9

The procedure of Example 1 was repeated except that the 2.84 g of 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzo-furan was replaced by 3.0 g of 5-hydroxy-2-oxo-3-(3-methyl-4-acetylaminophenyl)-2,3-dihydrobenzofuran and the 4.8 g of 4-amino-3-methylphenyltartronic acid by 4.8 g of 4-morpholinophenyltartronic acid. The product, 3-(3-(3-methyl-4-aminophenyl)-7-(4-morpholinophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b'] -difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 655 nm.

When applied to polyester from an aqueous dispersion it gives bright blue shades with good heat fastness and wash treatments.

The 5-hydroxy-2-oxo-3(3-methyl-4-acetylamniophenyl)-2,3-hydrobenzofuran used in this Example was prepared by stirring 14 g of 3-methyl-4-acetylaminomandelic acid with 6.9 g of hydroquinone in 95 ml of acetic acid and 5 ml of 100% sulphuric acid at 80° C. for 12 hours, cooling to ambient temperature and drowning into 1 liter of water. The precipitate was isolated by filtration, washed acid-free with water and dried.

EXAMPLE 10

The procedure of Example 9 was repeated except that in place of the 4.8 g of 4-morpholinophenyltartronic acid there was used 4.0 g of 4-amino-3-ethylphenyltartronic acid. The product, 3-(3methyl-4-aminophenyl)-7-(3-ethyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 660 nm.

When applied to polyester from an aqueous dispersion it gives bright blue shades with good fastness to heat and wash treatments.

EXAMPLE 11

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 3.9 g of 4-N-isopropylamino-3-methylphenyltartronic acid. The product, 3-(4-aminophenyl)-7-(4-isopropylamino-3-methylphenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 655 nm.

When applied to polyester from aqueous dispersions it gives bright blue shades with good wet fastness and good heat fastness.

EXAMPLE 12

The procedure of Example 1 was repeated except that in place of the 4.8 g of 4-amino-3-methylphenyltartronic acid there was used 3.5 g of 4-N-sec-butylaminophenyltartronic acid. The product, 3-(4-aminophenyl)-7-(4-sec-butylaminophenyl)-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 676 nm.

When applied to polyester it gives blue shades with good heat and wet fastness.

EXAMPLE 13

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3methylphenyltartronic acid was replaced by 3.6 g of 4-piperidinophenyltartronic acid. The product, 3-(4-aminophenyl)-7-(4-piperidinophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 664 nm.

When applied to polyester materials it gives blue shades with good fastness to heat and wet treatments.

EXAMPLE 14

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 3.6 g of 1,2,3,4-tetrahydroquinolin-6-yltartronic acid. The product, 3-(4-aminophenyl)-7-(1,2,3,4-tetrahydroquinolin-6-yl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 678 nm.

When applied to polyester materials from aqueous dispersions it gives blue shades with good heat and wet fastness.

EXAMPLE 15

A mixture of 0.62 g of 4-methylaminophenol, 4.4 g of 4-diethylaminophenyltartronic acid (as the dipotassium salt) and 25 ml of glacial acetic acid was stirred under reflux for 5 hours. 1.14 g of ammonium persulphate was then added and heating continued for 1 hour. After cooling to ambient temperature, 25 ml of water was added and the product, 3,7-di(4-diethylaminophenyl)-2,6-dioxo-5-methyl-2,6-dihydro-5H-furo[2:3-f]indole, isolated by filtration. It dissolves in chloroform to give greenish blue solutions having an absorption maximum at 676 nm.

When applied to polyester materials it gives greenish blue shades with good wet and heat fastness.

EXAMPLE 16

In place of the 0.62 g of 4-methylaminophenol used in Example 15 there was used 0.62 g of 2-methylhydroquinone. The product, 3,7-di(4-diethylaminophenyl)-4-methyl-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, dissolves in chloroform to give a greenish blue solution having an absorption maximum at 685 nm.

When applied to polyester materials it gives greenish blue shades with good fastness to heat and wet treatments.

EXAMPLE 17

1.0 g of the product obtained as in Example 1 was dissolved in a mixture of 25 ml of methylethylketone and 10 ml of acetic acid. 1.0 g of sodium borohydride was added portionwise, the temperature rising to 50° C. After stirring for 1 hour a further 1.0 g of sodium borohydride was added, the temperature again rising to 50° C. After 15 minutes the reaction was complete as judged by TLC.

The reaction mixture was poured into 250 ml water and the precipitated product, 3-(4-sec-butylaminophenyl)-7-(4-sec-butylamino-3-methylphenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, isolated by filtration, washing with water and drying. It dissolves in pyridine to give a greenish-blue solution having an absorption maximum at 695 nm.

When applied to polyester materials from aqueous dispersions it gives greenish-blue shades with good heat and wet fastness.

EXAMPLE 18

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 5.0 g of 4-beta-hydroxyethyl-3-methylphenyltartronic acid to give 3-(4-aminophenyl)-7-(4-beta-hydroxyethylamino-3-methylphenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran. This dissolved in pyridine to give a blue solution having an absorption maximum at 670 nm.

When applied to polyesters materials from aqueous dispersions it gave blue shades with good heat and wet fastness.

EXAMPLE 19

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.6 g of 4-amino-3,5-dimethylphenyltartronic acid to give 3-(4-aminophenyl)-7-(4-amino-3,5-dimethylphenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. It dissolves in pyridine to give a blue solution having an absorption maximum at 662 nm.

When applied to polyesters materials it gave blue shades with good heat and wet fastness.

EXAMPLE 20

The procedure of Example 1 was repeated except that the 2.84 g of 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzo-furan was replaced by 2.84 g of 5-hydroxy-2-oxo-3(4-n-propylphenyl)-2,3-dihydrobenzofuran to give 3-(4-n-propoxyphenyl)-7-(4-amino-3-methylphenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran. It dissolves in pyridine to give a reddish-blue solution having an absorption maximum at 620 nm.

When applied to polyester materials it builds up to give away blue shades with good heat and wet fastness.

EXAMPLE 21

The procedure of Example 9 was repeated except that the 3.0 g of 5-hydroxy-2-oxo-3(3-methyl-4-acetylaminophenyl)-2,3-dihydrobenzofuran was replaced by 2.84 g of 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzofuran to give 3-(4-aminophenyl)-7-(4-morpholinophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']-difuran. This dissolves in ethylacetate to give a blue solution having an absorption maximum at 618 nm.

When applied to polyester materials it gives reddish-blue shades with good heat and wet fastness.

EXAMPLE 22

1 g of the product obtained from Example 21 was added to a mixture of 50 ml of acrylic acid and 3.2 ml water and the mixture stirred at 70°-75° C. for 3 hours. After cooling to ambient temperature, 85 ml of water was added and the product isolated by filtration, washing with water and drying.

It was then added to a mixture of 20 ml of 2-ethoxyethanol and 1 ml of 100% sulphuric acid and heated at 70°-80° C. for 4 hours. After cooling the mixture was added to water (200 ml). The product 3-(4-(bis-[2-(2-ethoxyethyoxycaronbyl)ethyl]aminophenyl)-7-(4-morpholinophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']-difuran isolated by filtration, washed with water and dried. It dissolves in pyridine to give a blue solution having an absorption maximum at 665 n.

When applied to polyester textile materials it gives blue shades with good heat and wet fastness.

EXAMPLE 23

A mixture of 2.26 g of 5-hydroxy-2-oxo-3-phenyl-2,3-dihydrobenzofuran, 3.0 g of 4-hydroxyphenyltartronic acid (as the dipostassium salt), 23.75 ml of glacial acetic acid and 1.25 ml of concentrated sulphuric acid was stirred under reflux for 12 hours. After the addition of 2.2 g ammonium persulphate heating continued for 1 hour and cooled to ambient temperature. The cool mixture was added to 250 ml water and the product, 3-phenyl-7-(4-hydroxyphenyl)-2,6-dioxo- 2,6-dihydrobenzo]1:2-b, 4:5-b']difuran, isolated by filtration, washed successively with water and methanol and dried.

A mixture of 1.6 g of this product, 1.38 g K₂ CO₃ (anhyd), 2.2 g ethoxyethyl bromoacetate and 25 ml of sulpholane was stirred and heated at 110° C. for 2 hours. The mixture was cooled to ambient temperature and added to 250 ml of stirred water. The product, 3-phenyl-7(4-(ethoxyethoxycarbonylmethoxy)phenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, was isolated by filtration, washed successively with water and methanol and dried.

EXAMPLE 24

The procedure of Example 23 is repeated except that the 2.26 g of 5-hydroxy-2-oxo-3-phenyl-2,3-dihydrobenzofuran was replaced by 2.84 g of 5-hydroxy-2-oxo-3-(4-n-propoxyphenyl)-2,3-dihydrobenzo-furan. The product, 3-(4-hydroxyphenyl)-7-(4-n-propoxyphenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, was isolated as in Example 23.

A mixture of 1.86 g of this product, 1.38 g K₂ CO₃ (anhyd), 2.2 g ethoxyethyl bromoacetate and 25 ml of sulpholane was stirred and heated at 110° C. for 21/2 hours. After cooling to ambient temperature, the mixture was added to 250 ml of water. The product, 3-(4-n-propoxyphenyl)-7(4-(ethoxyethoxycarbonylmethoxy)phenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']difuran, was isolated by filtration, washed successively with water and methanol and dried.

When applied to polyester materials from aqueous dispersion it gives bright bluish-red shades with good build up, good heat and light fastness and good wet fastness.

EXAMPLE 25

The procedure of Example 1 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.8 g of 4-amino-3-ethylphenyltartronic acid. The product, 3-(4-aminophenyl)-7-(4-amino-3-ethylphenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran, dissolves in pyridine to give a blue shade having an absorption maximum at 657 nm.

When a 50/50 mixture of this product and that of Example 1 was applied to polyesters materials from aqueous dispersions it gave bright blue shades with good build up and good heat and wet fastness.

EXAMPLE 26

The procedure of Example 1 was repeated except that the 2.84 g of 5-hydroxy-2-oxo-3-(4-acetylaminophenyl)-2,3-dihydrobenzo-furan was replaced by 3.0 g of 5-hydroxy-2-oxo-3-(4-acetylamino-3-methylphenyl)-2,3-dihydrobenzofuran. The product, 3,7-di-((3-methyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo[1:2-b, 4:5-b']-difuran, dissolves in pyridine to give a blue solution having an absorption maximum at 660 nm.

When applied to polyesters materials it gives bright blue shades with good heat fastness and good fastness to wash treatments.

EXAMPLE 27

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.4 g of 4-amino-3,5-dimethylphenyltartronic acid to give 3-phenyl-7-(4-amino-3,5-dimethylphenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 580 nm.

When applied to polyester materials it builds up to give navy blue shades with good heat and wet fastness.

EXAMPLE 28

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.6 g of 4-amino-3-ethylphenyltartronic acid to give 3-phenyl-7-(3-ethyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 568 nm.

When applied to polyester materials it builds up to give navy blue shades with good heat and wet fastness.

EXAMPLE 29

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.7 g of 4-amino-3-n-propylphenyltartronic acid to give 3-phenyl-7-(3-n-propyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 568 nm.

When applied to polyester materials it builds up to give navy blue shades with good heat and wet fastness.

EXAMPLE 30

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 4.5 g of 4-amino-3-methoxyphenyltartronic acid to give 3-phenyl-7-(3-methoxy-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 600 nm.

When applied to polyester materials it builds up to give navy blue shades with good heat and wet fastness.

EXAMPLE 31

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 5.3 g of 4-amino-3-ethoxyphenyltartronic acid to give 3-phenyl-7-(3-ethoxy-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 600 nm.

When applied to polyester materials it builds up to give navy blue shades with good heat and wet fastness.

EXAMPLE 32

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 5.5 g of 4-amino-3-methylphenyltartronic acid to give 3-phenyl-7-(3-n-propoxy-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 605 nm.

When applied to polyester materials it builds up to give navy blue shades with good heat and wet fastness.

EXAMPLE 33

The procedure of Example 8 was repeated except that the 4.8 g of 4-amino-3-methylphenyltartronic acid was replaced by 5.0 g of 3-methyl-4-N-ethylaminophenyltartronic acid to give 3-phenyl-7-(3-methyl-4-N-ethylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b, 4:5-b']difuran. This dissolves in chloroform to give a reddish-blue shade having an absorption maximum at 620 nm.

When applied to polyester materials it builds up to give away blue shades with good heat and wet fastness.

The dyes identified in Tables 4 and 5 were prepared by the method of Example 1 using equivalent amounts of the substituted mandelic acid ##STR10## in place of the 4-acetylaminomandelic acid and of the substituted phenyl tartronic acid ##STR11## in place of 4-amino-3-methylphenyltartronic acid. In the case of the substituted mandelic acids in which R¹ and R² are H or R⁶ is NH₂, the amino group was protected with an acetyl group which was subsequently removed by acid hydrolysis as described in Example 1.

In Table 4 the dyes correspond to Formula VII in which X¹, X², R⁵ and R⁸ are all H and Z¹ and Z² are both O.

                                      TABLE 4                                      __________________________________________________________________________     Ex R.sup.6      R.sup.1   R.sup.2                                                                               R.sup.4                                                                              R.sup.7                                                                              λmax/Shade                 __________________________________________________________________________     34 NHCH.sub.3   H         H      H     H     Mid Blue                          35 N(CH.sub.3).sub.2                                                                           CH.sub.3  CH.sub.3                                                                              H     H     Turquoise                         36 NHCH(CH.sub.3).sub.2                                                                        H         H      H     H     Mid Blue                          37 N(C.sub.2 H.sub.5).sub.2                                                                    H         H      H     H     Greenish-                                                                      blue                              38 NHEtCOOEt    C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     H     Greenish-                                                                      blue                              39 NHEtCOOMe    H         H      H     H     656                               40 NHEtCOOEt    H         H      H     H     Mid Blue                          41 N(C.sub.2 H.sub.5).sub.2                                                                    EtCOOEtOMe                                                                               as R.sup.1                                                                            H     H     701                               42 NHEtCOOEtOMe H         H      H     H     Mid Blue                          43 N(C.sub.2 H.sub.5).sub.2                                                                    EtCOOMe   as R.sup.1                                                                            H     H     688                               44 N(EtCOOMe).sub.2                                                                            H         C.sub.2 H.sub.5                                                                       CH.sub.3                                                                             H     655                               45 NH.sub.2     C.sub.2 H.sub.5                                                                          EtCOOEt                                                                               H     H     Greenish-                                                                      blue                              46 NHCH.sub.2 Ph                                                                               H         H      H     H     Mid blue                          47 N-morpholino CH(CH.sub.3).sub.2                                                                       EtCOOMe                                                                               H     H     672                               48 N(C.sub.2 H.sub.4 OH).sub.2                                                                 EtCOOMe   as R.sup.1                                                                            H     H     Greenish-                                                                      blue                              49 N(EtOCOMe).sub.2                                                                            EtCOOMe   as R.sup.1                                                                            H     H     Greenish-                                                                      blue                              50 N-piperidino EtCOOEtOMe                                                                               as R.sup.1                                                                            H     H     684                               51 N-piperidino EtCOOMe   as R.sup.1                                                                            H     H     677                               52                                                                                 ##STR12##   C.sub.2 H.sub.4 CN                                                                       EtCOOMe                                                                               H     H     Greenish-                                                                      blue                              53 NHC.sub.2 H.sub.4 OH                                                                        C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     H     Greenish                                                                       blue                              54 N(C.sub.2 H.sub.4 OH).sub.2                                                                 H         H      H     H     Greenish-                                                                      blue                              55 NHCH(CH.sub.3).sub.2                                                                        C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     H     705                               56 NH.sub.2     H         H      CH.sub.3                                                                             Cl    656                               57 N-morpholino CH(CH.sub.3)C.sub.2 H.sub.5                                                              H      CH.sub.3                                                                             H     675                               58 N-morpholino CH(CH.sub.3).sub.2                                                                       H      CH.sub.3                                                                             H     670                               59 N-morpholino CH(CH.sub.3).sub.2                                                                       H      H     H     674                               60 N-morpholino CH(CH.sub.3)C.sub.2 H.sub.5                                                              H      H     H     676                               61 NHEtCOOEt    EtCOOEt   H      CH.sub.3                                                                             H     650                               62 NHEtCOOMe    CH(CH.sub.3).sub.2                                                                       H      H     H     688                               63 NHC.sub.2 H.sub.5                                                                           CH(CH.sub.3)C.sub.2 H.sub.5                                                              H      CH.sub.3                                                                             CH.sub.3                                                                             689                               64 NHCH(CH.sub.3).sub.2                                                                        CH(CH.sub.3)C.sub.2 H.sub.5                                                              H      H     H     698                               65 NHC.sub.6 H.sub.13                                                                          CH(CH.sub.3).sub.2                                                                       H      H     H     693                               66 NHC.sub.2 H.sub.5                                                                           CH(CH.sub.3).sub.2                                                                       H      CH.sub.3                                                                             CH.sub.3                                                                             691                               67 NH[CH]       [CH]      H      CH.sub.3                                                                             H     Turquoise                         68 NHEtCOOMe    CH(CH.sub.3)C.sub.2 H.sub.5                                                              H      H     H     688                               69 NH[CH]       H         H      H     H     Mid Blue                          70 NH(s-C.sub.4 H.sub.9)                                                                       H                                                              s-C.sub.4 H.sub.9                                                                 CH.sub.3     C.sub.2 H.sub.5                                                                          695                                                  71 N(C.sub.2 H.sub.5).sub.2                                                                    H         H      CH.sub.3                                                                             H     674                               72 NHC.sub.2 H.sub.5                                                                           H         H      CH.sub.3                                                                             CH.sub.3                                                                             Greenish-                                                                      blue                              73 NHCH(CH.sub.3 C.sub.2 H.sub.5                                                               C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     H     Turquoise                         74 N(C.sub.2 H.sub.5).sub.2                                                                    CH(CH.sub.3).sub.2                                                                       H      CH.sub.3                                                                             H     "                                 75 NH[CH[-pCH.sub.3                                                                            C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     H     "                                 76 NHCH(CH.sub.3).sub.2                                                                        C.sub.2 H.sub.5                                                                          CH.sub.2Ph                                                                            H     H     "                                 77                                                                                 ##STR13##   C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     CH.sub.3                                                                             Turquoise                         78 N(CH.sub.3).sub.2                                                                           H         H      H     H     Greenish-                                                                      blue                              79 NH.sub.2     C.sub.2 H.sub.5                                                                          CH.sub.2Ph                                                                            H     H     Greenish-                                                                      blue                              80 NHCH(CH.sub.3).sub.2                                                                        CH(CH.sub.3).sub.2                                                                       H      CH.sub.3                                                                             H     689                               81 NHEtCOOMe    C.sub.2 H.sub.5                                                                          EtCOOMe                                                                               H     H     Greenish-                                                                      blue                              82 NH.sub.2     H         H      OC.sub.2 H.sub.5                                                                     H     664                               83 N(CH.sub.3).sub.2                                                                           CH(CH.sub.3).sub.2                                                                       H      H     H     Turquoise                         84  NHC.sub.6 H.sub.13                                                                         C.sub.2 H.sub.5                                                                          C.sub.2 H.sub.5                                                                       H     H     "                                 85 NH.sub.2     C.sub.4 H.sub.9                                                                          C.sub.3 H.sub.6Ph                                                                     H     H     "                                 __________________________________________________________________________

In Table 4 and the subsequent tables:

    __________________________________________________________________________     --NH--[CH]--pCH.sub.3 = 4-methylcyclohexylamino--                              __________________________________________________________________________     --[CH] =   cyclohexyl  Ph =     phenyl                                         --EtCOOEtOMe =                                                                            --C.sub.2 H.sub.4 CO.sub.2 C.sub.2 H.sub.4 OCH.sub.3                                       --EtCOOMe =                                                                             --C.sub.2 H.sub.4 CO.sub.2 CH.sub.3            --EtCOOEt =                                                                               --C.sub.2 H.sub.4 CO.sub.2 C.sub.2 H.sub.5                                                 --OEtMe =                                                                               --OC.sub.2 H.sub.4 OCH.sub.3                   --OEtOEt = --OC.sub.2 H.sub.5 OC.sub.2 H.sub.5                                                        --OEtOCOMe =                                                                            --OC.sub.2 H.sub.5 OCOCH.sub.3                 __________________________________________________________________________

In Table 5 the dyes correspond to Formula VII in which X¹, X², R⁵, R⁷ and R⁸ are all H and Z¹ and Z² are both O.

                                      TABLE 5                                      __________________________________________________________________________     Ex R.sup.6                                                                              R.sup.1 R.sup.2 R.sup.4                                                                            max/Shade                                         __________________________________________________________________________     86 --OCH.sub.3                                                                          --EtCOOMe                                                                              --C.sub.2 H.sub.4 CN                                                                   --H Reddish-blue                                      87 --OCH.sub.3                                                                          --EtCOOMe                                                                              --C.sub.2 H.sub.4 CO.sub.2 CH.sub.3                                                    --H   "                                               88 --H   --C.sub.2 H.sub.5                                                                      --H     --H 607                                               89 --OC.sub.3 H.sub.7                                                                   --CH.sub.3                                                                             --CH.sub.3                                                                             --H Navy                                              90 --H   --CH.sub.3                                                                             --H     --H Reddish-blue                                      91 --H   --H     --H     --H   "                                               92 --OC.sub.3 H.sub.7                                                                   --EtCOOMe                                                                              --C.sub.2 H.sub.4 CN                                                                   --H Navy                                              93 --H   --C.sub.2 H.sub.5                                                                      --C.sub.2 H.sub.4 OH                                                                   --H 647                                               94 --H   --C.sub.2 H.sub.5                                                                      --EtOCOMe                                                                              --H Navy                                              95 --CH.sub.3                                                                           --H     --H     --CH.sub.3                                                                         Reddish-blue                                      96 --H   --CH.sub.3                                                                             --CH.sub.3                                                                             --H   "                                               97 --H   --EtCOOEt                                                                              --H     --H   "                                               98 --H   --C.sub.4 H.sub.9                                                                      --C.sub.3 H.sub.6 --Ph                                                                 --H Navy                                              __________________________________________________________________________

Further dyes in accordance with Formula VII which can be made by the same process as the dyes in Tables 4 and 5 are shown in Tables 6, 7 and 8. In the dyes shown in Table 6 X¹, X², R⁵, R⁷ and R⁸ are all H and Z¹ and Z² are both O.

                  TABLE 6                                                          ______________________________________                                         Example R.sup.6   R.sup.4     R.sup.1                                                                             R.sup.2                                     ______________________________________                                          99     --H       --Cl        --H  --H                                         100     --H       --C.sub.4 H.sub.9                                                                          --H  --H                                         101     --H       --CH.sub.3  --H  --C.sub.2 H.sub.4 OH                        102     --H       --CH.sub.3  --H  --C.sub.2 H.sub.4 CN                        103     --H       --CH.sub.3  --H  --C.sub.2 H.sub.4 Cl                        104     --H       --C.sub.2 H.sub.5                                                                          --H  --EtOCOMe                                   105     --H       --C.sub.2 H.sub.5                                                                          --H  --EtCOOMe                                   106     --H       --CH.sub.3  --H  --C.sub.2 H.sub.4 OCH.sub.3                 107     --H       --CH.sub.3  --H  --C.sub.3 H.sub.6 --Ph                      108     --H       --OC.sub.4 H.sub.9                                                                         --H  --H                                         109     --H       --OEtOEt    --H  --H                                         110     --H       --OEtOCOMe  --H  --H                                         111     --H       --OC.sub.2 H.sub.4 CN                                                                      --H  --H                                         112     --H       --OCH.sub.3 --H  --C.sub.2 H.sub.4 CN                        113     --H       --OCH.sub.3 --H  --EtOCOMe                                   114     --H       --Br        --H  --C.sub.2 H.sub.4 OCH.sub.3                 115     --CH.sub.3                                                                               --CH.sub.3  --H  --H                                         116     --C.sub.2 H.sub.5                                                                        --CH.sub.3  --H  --C.sub.2 H.sub.5                           117     --Cl      --CH.sub.3  --H  --C.sub.3 H.sub.7                           118     --OCH.sub.3                                                                              --H         --H  --H                                         119     --OC.sub.4 H.sub.9                                                                       --H         --H  --H                                         120     --H       --H         --H  --C.sub.6 H.sub.13                          121     --H       --CH.sub.3  --H  --C.sub.6 H.sub.13                          122     --OCH.sub.3                                                                              --H         --H  --C.sub.8 H.sub.17                          ______________________________________                                    

In the dyes shown in Table 7 X¹, X², R⁵ and R⁸ are all H and Z¹ and Z² are both O.

                                      TABLE 7                                      __________________________________________________________________________     Ex  R.sup.6 R.sup.7                                                                              R.sup.4                                                                             R.sup.1                                                                               R.sup.2                                          __________________________________________________________________________     123 --NH.sub.2                                                                             --Cl  --CH.sub.3                                                                          --H    --C.sub.2 H.sub.5                                124 --NH.sub.2                                                                             --Br  --H  --H    --H                                              125 --NH.sub.2                                                                             --OEtOMe                                                                             --H  --C.sub.2 H.sub.5                                                                     --C.sub.2 H.sub.5                                126 --NH.sub.2                                                                             --C.sub.3 H.sub.7                                                                    --H  --H    --H                                              127 --NH.sub.2                                                                             --C.sub.2 H.sub.5                                                                    --CH.sub.3                                                                          --H    --C.sub.2 H.sub.4 CN                             128 --OC.sub.3 H.sub.7                                                                     --H   --H  --C.sub.2 H.sub.4 CN                                                                  --EtCOOMe                                        129 --N(C.sub.2 H.sub.5).sub.2                                                             --H   --H  --EtCOOMe                                                                             --EtCOOMe                                        130 --N(C.sub.2 H.sub.4 OH).sub.2                                                          --CH.sub.3                                                                           --H  --C.sub.2 H.sub.5                                                                     --C.sub.3 H.sub.7                                131 --H     --H   --H  --C.sub.2 H.sub.5                                                                     --C.sub.2 H.sub.5                                132 --CH.sub.3                                                                             --H   --H  --C.sub.2 H.sub.5                                                                     --C.sub.2 H.sub.5 OH                             133 --OCH.sub.3                                                                            --Cl  --H  --C.sub.2 H.sub.5                                                                     --C.sub.2 H.sub.5                                134 --N(C.sub.2 H.sub.5).sub.2                                                             --H   --CH.sub.3                                                                          --H    --EtOCOMe                                        135 --NHC.sub.2 H.sub.5                                                                    --CH.sub.3                                                                           --H  --C.sub.2 H.sub.4 OH                                                                  --C.sub.2 H.sub.5                                136 --NHC.sub.2 H.sub.4 OH                                                                 --CH.sub.3                                                                           --CH.sub.3                                                                          --H    --C.sub.2 H.sub.4 CN                             137 --NH.sub.2                                                                             --H   --CH.sub.3                                                                          --H    --Ph                                             138 --NHC.sub.2 H.sub.5Y                                                                   --H   --H  --H    4-Cl--Ph--                                       __________________________________________________________________________

In the dyes shown in Tables 8 X¹ and X² are both H and Z¹ and Z² are both O.

                  TABLE 8                                                          ______________________________________                                         Ex    R.sup.7                                                                               R.sup.6  R.sup.8                                                                             R.sup.4                                                                              R.sup.5                                                                              R.sup.1                                                                               R.sup.2                          ______________________________________                                         139   --H    --NH.sub.2                                                                              --H  --CH.sub.3                                                                           --C.sub.2 H.sub.5                                                                    --H    --H                              140   --Cl   --OC.sub.3 H.sub.7                                                                      --Cl --H   --H   --H    --H                              141   --Cl   --NH.sub.2                                                                              --Cl --H   --H   --C.sub.2 H.sub.5                                                                     --H                              142   --H    --H      --H  --C.sub.2 H.sub.5                                                                    --H   --H    --H                              ______________________________________                                     

We claim:
 1. A compound of Formula I: ##STR14## wherein: X¹ and X² are both H;Z¹ and Z² are both O; R¹ is selected from H, C₁₋₂₀ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl-C₁₋₄ -alkylene, and phenyl; R² is H; Ring B carries a methyl group adjacent to NR¹ R² ; and Ring A is unsubstituted or substituted in the 4-position by an alkyl or alkoxy group.
 2. A compound of Formula VII: ##STR15## wherein: X¹ and X² are identical and are selected from H, halogen, cyano, C₁₋₂₀ -alkyl, C₁₋₄ -alkoxy, phenyl, carbamoyl, sulphamoyl, COOH and carbonylic acid ester, and phenyl substituted by a group selected from the group consisting of hydroxy, halogen, nitro, C₁₋₄ -alkyl and C₁₋₄ -alkoxy;Z¹ and Z² are both --O--; R¹ is selected from H, C₁₋₂₀ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl and phenyl-C₁₋₄ -alkylene each of which is unsubstituted or is substituted by a group selected from C₁₋₄ -alkyl, C₁₋₄ -alkoxy, nitro, halogen, C₁₋₄ -alkoxy-C₁₋₄ -alkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkylcarbonyl, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkylcarbonyloxy, cyano and amino; R² l is H; R⁴ and R⁵ are each independently selected from H, halogen, C₁₋₄ -alkyl, C₃₋₄ -alkenyl and C₁₋₁₀ -alkoxy; R⁶ is selected from H, halogen, C₁₋₄ -alkyl, C₃₋₄ -alkenyl, C₁₋₁₀ -alkoxy group and a group NR¹ R^(2A) in which R¹ is as hereinbefore defined and R^(2A) is selected from H, C₁₋₂₀ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl and phenyl-C₁₋₄ -alkylene each of which is unsubstituted or is substituted by a group selected from C₁₋₄ -alkyl, C₁₋₄ -alkoxy, nitro, halogen, C₁₋₄ -alkoxy,-C₁₋₄ -alkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkylcarbonyl, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxycarbonyloxy, cyano and amino; R⁷ and R⁸ are each independently selected from H, halogen, C₁₋₄ -alkyl, C₃₋₃ -alkenyl and C₁₋₁₀ -alkoxy group;and where R⁶ is NR¹ R^(2A) this may be the same as or different from the NR¹ R² group present in Ring B, provided that one of R⁴ and R⁵ is other than H; and provided that the number or pattern of substituents in Ring A and Ring B are different.
 3. A compound of Formula VII: ##STR16## wherein: X¹ and X² are identical and are selected from H, halogen, cyano, C₁₋₂₀ -alkyl, C₁₋₄ -alkoxy, phenyl, carbamoyl, sulphamoyl, COOH and carbonylic acid ester, and phenyl substituted by a group selected from the group consisting of hydroxy, halogen, nitro, C₁₋₄ -alkyl and C₁₋₄ -alkoxy;Z¹ and Z² are both --O--; R¹ is selected from H, or from C₁₋₂₀ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl and phenyl-C₁₋₄ -alkylene each of which is unsubstituted or substituted by a group selected from C₁₋₄ -alkyl, C₁₋₄ -alkoxy, nitro, halogen, C₁₋₄ -alkoxy-C₁₋₄ -alkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkylcarbonyl, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkylcarbonyloxy, cyano and amino; R² is selected from C₁₋₂ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl and phenyl-C₁₋₄ -alkene each of which is substituted by a group selected from C₁₋₄ -alkyl, C₁₋₄ -alkoxy, nitro, halogen, C₁₋₄ -alkoxy-C₁₋₄ -alkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkylcarbonyl, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, cyano and amino; or R¹ and R² together with the N atom to which they are attached, form a piperidino or morpholino group; R⁴ and R⁵ are each independently selected from H, halogen, C₁₋₄ -alkyl, C₃₋₄ -alkenyl and C₁₋₁₀ -alkoxy; R⁶ is selected from H, halogen, C₁₋₄ -alkyl, C₃₋₄ -alkenyl, C₁₋₁₀ -alkoxy group and a group NR⁹ R¹⁰ in which R⁹ and R¹⁰ are each independently selected from H, C₁₋₂₀ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl and phenyl-C₁₋₄ -alkylene each of which is unsubstituted or is substituted by a group selected from C₁₋₄ -alkyl, C₁₋₄ -alkoxy, nitro, halogen, C₁₋₄ -alkoxy-C₁₋₄ -alkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkylcarbonyl, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxycarbonyloxy, cyano and amino; R⁷ and R⁸ are each independently selected from H, halogen, C₁₋₄ -alkyl, C₃₋₃ -alkenyl and C₁₋₁₀ -alkoxy group;provided that the number or pattern of substituents in Ring A and Ring B are different.
 4. A compound according to claim 2 wherein R⁶ l is NR¹ R^(2A) in which R¹ and R^(2A) are each independently selected from H, C₁₋₆ -alkyl, C₃₋₄ -alkenyl, cyclohexyl and C₁₋₄ -alkyl which is substituted by a group selected from the group consisting of C₁₋₄ -alkyl, C₁₋₄ -alkoxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxy, nitro, cyano, halogen, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkcarbonyl, amino, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl and C₁₋₄ -alkoxycarbonyloxy and, R¹ and R² together with the nitrogen atom to which they are attached form a piperidino or morpholino group.
 5. A compound according to claim 2 or claim 3 wherein X¹ and X² are identical and are selected from H, halogen, cyano or from C₁₋₄ -alkyl, C₁₋₄ -alkoxy and phenyl each of which is unsubstituted or is substituted by a group selected from hydroxy, halogen, nitro, C₁₋₄ -alkyl and C₁₋₄ -alkoxy.
 6. A compound according to claim 2 or claim 3 wherein one of R⁴, R⁵, R⁶, R⁷ and R⁸ is selected from chlorine and bromine or from C₁₋₄ -alkyl and C₁₋₄ -alkoxy each of which is unsubstituted or is substituted by a group selected from C₁₋₄ -alkoxy, hydroxy, C₁₋₄ alkylcarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyl, halogen and cyano.
 7. A compound according to claim 2 or claim 3 wherein X¹, X² and R² are H, Z¹ and Z² are oxygen, R¹ is H or C₁₋₄ -alkyl, R⁴, R⁵, R⁷ and R⁸ are each independently selected from H, C₁₋₄ -alkyl and C₁₋₄ -alkoxy and R⁶ is NH₂.
 8. A compound of Formula VII: ##STR17## wherein: X¹ and X² are identical and are selected from H, halogen, cyano, C₁₋₂₀ -alkyl, C₁₋₄ -alkoxy, phenyl, carbamoyl, sulphamoyl, COOH and carbonylic acid ester, and phenyl substituted by a group selected from the group consisting of hydroxy, halogen, nitro, C₁₋₄ -alkyl and C₁₋₄ -alkoxy;Z¹ and Z² are both --O--; R¹ is selected from H, C₁₋₂₀ -alkyl, C₂₋₂₀ -alkenyl, C₄₋₈ -cycloalkyl, phenyl and phenyl-C₁₋₄ -alkylene each of which is unsubstituted or is substituted by a group selected from C₁₋₄ -alkyl, C₁₋₄ -alkoxy, nitro, halogen, C₁₋₄ -alkoxy-C₁₋₄ -alkoxy, cyclohexyl, phenyl, diphenyl, hydroxy, C₁₋₄ -alkylcarbonyl, C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyl, C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkoxy-C₁₋₄ -alkoxycarbonyloxy, C₁₋₄ -alkylcarbonyloxy, cyano and amino; or PG,42 R¹ and R² together with the N atom to which they are attached, form a piperidino or morpholino group; R⁴ and R⁵ are each independently selected from H, halogen, C₁₋₄ -alkyl, C₃₋₄ -alkenyl and C₁₋₁₀ -alkoxy;R⁶ is selected from H, halogen, C₁₋₄ -alkyl, C₃₋₄ -alkenyl, C₁₋₁₀ -alkoxy group and a group NR¹ R² in which R¹ and R² are each independently as hereinbefore defined; R⁷ and R⁸ are each independently selected from H, halogen, C₁₋₄ -alkyl, C₃₋₃ -alkenyl and C₁₋₁₀ -alkoxy group;and where R⁶ is NR¹ R², this may be the same as or different from the NR¹ R² group present in Ring B, provided that the number or pattern of substituents in Ring A and Ring B are different, except for the compound in which each of R¹ and R² are methyl, and each of R⁴, R⁵, R⁶, R⁷, R⁸, X¹ and X² is hydrogen.
 9. A compound of the formula: ##STR18## wherein X¹, X², R¹, R⁵, R⁷ and R⁸ are H, Z¹ and Z² are oxygen, R² is H, C₁₋₄ -alkyl, R⁴ is C₁₋₄ -alkyl or C₁₋₄ -alkoxy and R⁶ is H, C₁₋₄ -alkyl or C₁₋₄ -alkoxy.
 10. A compound selected from:3-(4-aminophenyl)-7-(3-methyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-(4-aminophenyl)-7-(3-ethyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-phenyl-7-(3-methyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-phenyl-7-(3-ethyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-phenyl-7-(3-ethoxy-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-phenyl-7-(3-n-propoxy-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-phenyl-7-(3-n-propyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-phenyl-7-(3-methyl-4-N-ethylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, 3-(4-n-propoxyphenyl)-7-(3-methyl-4-aminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b; 4:5-b']-difuran, and 3-phenyl-7-(N,N-diethylaminophenyl)-2,6-dioxo-2,6-dihydrobenzo-[1:2-b:4:5-b']-difuran. 